A generator for generating an update package for efficiently updating the software and/or firmware in an electronic device, and a method for operating such a generator are disclosed. An embodiment of the disclosed invention may produce a compact update package comprising a set of instructions that may be executed within the electronic device to produce an updated binary image of the software and/or firmware. Pre-processing of the existing or new binary image may result in a further reduction in the size of the update package, shortening the time needed to transmit the update package to the electronic device.